Mattress cover fastening belt system



FIG. 1 is a perspective view of a mattress cover fastening belt systemshowing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a partial enlarged view of the area indicated by “A” in FIG.1.

The dot-dash broken lines indicating an enlargement portion of thedesign form no part of the claimed design.

CLAIM The ornamental design for a mattress cover fastening belt system,as shown and described.